We expect to update the Raspberry Pi version of the Wolfram Language soon after the final version of Mathematica 10.0.0 ships.

It should have feature parity (to the extent possible) with desktop versions of the Wolfram Language.

Thank you for your interest.

David,

See: http://blog.wolfram.com/2014/08/01/wolfram-language-and-mathematica-updated-for-the-raspberry-pi/

pi@test-pi-01 ~ $ wolfram
Wolfram Language (Raspberry Pi Pilot Release)
Copyright 1988-2014 Wolfram Research
Information & help: wolfram.com/raspi

In[1]:= trainingset = {1->"A",2->"A",3.5->"B",4->"B"};

In[2]:= c = Classify[trainingset];

In[3]:= c[2.6]

Out[3]= A

In[4]:= c[2.6, "Probabilities"]

Out[4]= <|A -> 0.979033, B -> 0.0209672|>

In[5]:= c[{2.6, 5.1, -7.2}]

Out[5]= {A, B, A}